Add php 8 build matrix for window, update readme

Author: AlexNDRmac

.appveyor.yml

@@ -53,6 +53,16 @@ environment:
       BUILD_TYPE: nts-Win32
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
 
+    - PHP_VERSION: 8.0
+      VC_VERSION: 15
+      BUILD_TYPE: Win32
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+
+    - PHP_VERSION: 8.0
+      VC_VERSION: 15
+      BUILD_TYPE: nts-Win32
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+
   PHP_SDK_VERSION: 2.1.9
   PHP_AVM: https://raw.githubusercontent.com/sergeyklay/php-appveyor/master/php-appveyor.psm1
 

README.md

@@ -7,7 +7,7 @@
 
 The Zephir Parser delivered as a C extension for the PHP language.
 
-Supported PHP versions: **7.0**, **7.1**, **7.2**, **7.3** and  **7.4**.
+Supported PHP versions: **7.0**, **7.1**, **7.2**, **7.3**,  **7.4** and **8.0**
 
 **NOTE:** The [`development`][:dev-branch:]
 branch will always contain the latest **unstable** version. If you wish to